[Reece]

A little oil on the mechanical bearings is good but be sure not to get any lube on the dial string. The string needs to grip the shaft that the knob turns. A good way to do this is to rub some rosin on the part of the string that will be pulled by that shaft. Violin bow rosin would be ideal, but might be hard for a particular individual to come across. Another way is to find a pine tree and take a drip of rosin off of the bark and dissolve it in a little bit of alcohol. Paint the solution on the string and allow to dry.